Twice now my computer shut down and rebooted asking for a boot cdrom or floppy. Each time it happened I was away from my desk and heard it reboot. The last time it happened it was about two months ago. I remember rebooting to check the bios. No hard drives were listed. I noticed the hard drive light was on. I opened the case and checked the cables and I thought the power supply wire was a bit loose on one so I pulled it and reinserted it. I did the same on the other drive and the same with the data cables on both ends, rebooted and checked the CMOS. The primary master and slave drives were listed as not installed. I set it for Auto detect, saved and continued with the boot process. The computer booted, the drives were found and the pc booted.
Yesterday, it happened again. I walked away and heard it reboot. Again, checking the CMOS setup, no drives were listed. Again, I changed the setting to auto detect and they were detected.
Each time this happened I was not doing anything that would require a lot of resources. Just reading some mail. The computer had been running for about three hours.
I use Motherboard Monitor and a shut down program for overheating or fan failure which I have set to shut down the computer. Encoding video, which can drive the CPU temp up to 154 degrees F in the summer without the A.C. on, is the only process, other than fan failure, that I have seen cause the CPU and case temperature to rise. I have the high CPU temperature alarm and shutdown set for 163 degrees F. I didn’t hear an alarm. My CPU temperature averages about 127 degrees F.
Motherboard: PCChips M830LR
CPU: AMD Athlon 1600
Memory: DDR2100 512 megs
Drives: Primary M: WD 100 gig ATA 100 Primary S: WD 100 gig ATA 100
Secondary M: Lite-on DVDRW LDW-811S
Secondary S: Mitsumi CR-48X9TE
Nero Imagedrive 2 SCSI CdRom Device
Nero Imagedrive SCSI controller
Axwhisky SCSI Controller
Display Adapter: SiS 300/305
AverDVD Video Capture
O.S. Windows 2000
I have had problems with this motherboard before but it has been running nicely for over a year now. Any ideas about why this is happening?